Explosive spalling and residual mechanical properties of fiber-toughened high-performance concrete subjected to high temperatures

• Published in: Cement and concrete research Vol. 36; no. 4; pp. 723 - 727
• Main Authors: Peng, Gai-Fei, Yang, Wen-Wu, Zhao, Jie, Liu, Ye-Feng, Bian, Song-Hua, Zhao, Li-Hong
• Format: Journal Article
• Language: English
• Published: New York, NY Elsevier Ltd 01.04.2006; Elsevier Science
• Subjects: Applied sciences; Building failures (cracks, physical changes, etc.); Buildings. Public works; Concretes. Mortars. Grouts; Durability. Pathology. Repairing. Maintenance; Exact sciences and technology; Explosive spalling; Fiber reinforcement; Fibre reinforced concrete (including asbestos cement); High-performance concrete; Materials; Mechanical properties; Temperature; Mechanical properties; Temperature; High-performance concrete; Fiber reinforcement; Explosive spalling; Construction materials; Temperature effect; High temperature; Experimental study; Failure analysis; Fiber reinforced concrete; Fracture energy; High strength concrete
• ISSN: 0008-8846; 1873-3948
• DOI: 10.1016/j.cemconres.2005.12.014

In this paper, an experimental investigation was conducted to explore the relationship between explosive spalling occurrence and residual mechanical properties of fiber-toughened high-performance concrete exposed to high temperatures. The residual mechanical properties measured include compressive strength, tensile splitting strength, and fracture energy. A series of concretes were prepared using OPC (ordinary Portland cement) and crushed limestone. Steel fiber, polypropylene fiber, and hybrid fiber (polypropylene fiber and steel fiber) were added to enhance fracture energy of the concretes. After exposure to high temperatures ranged from 200 to 800 °C, the residual mechanical properties of fiber-toughened high-performance concrete were investigated. For fiber concrete, although residual strength was decreased by exposure to high temperatures over 400 °C, residual fracture energy was significantly higher than that before heating. Incorporating hybrid fiber seems to be a promising way to enhance resistance of concrete to explosive spalling.